/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package identity

import (
	"os"
)

import (
	"github.com/google/uuid"
)

import (
	"github.com/arana-db/arana/pkg/util/net"
)

const (
	AranaNodeId = "ARANA_NODE_ID"
	PodName     = "POD_NAME"
)

func GetNodeIdentity() string {
	nodeId := os.Getenv(AranaNodeId)
	if len(nodeId) != 0 {
		return nodeId
	}

	podName := os.Getenv(PodName)
	if len(podName) != 0 {
		return podName
	}

	ip, err := net.FindSelfIP()
	if err == nil {
		return ip
	}

	return uuid.NewString()
}
